Injection apparatus



FIG. 1 is a perspective view taken from the front and left side of the injection apparatus, showing my new design;

FIG. 2 is a front elevational view of the injection apparatus, the rear elevational view being a mirror image of the front elevational view, and the top plan view and the bottom view being respectively identical to the front elevational view;

FIG. 3 is a right side elevational view thereof; and,

FIG. 4 is a left side elevational view thereof. 

The ornamental design for an injection apparatus, as shown and described. 